A culture of an organism believed to cause intestinal symptoms is viewed under the microscope, and the microbiologist observes a cell membrane, flagella, mitochondria, and some dark unrecognizable structures within each cell. The microbiologist notes that the cells are eukaryotic because
A. only eukaryotic cells have flagella.
B. the dark structures must be the cell nuclei.
C. only eukaryotic cells have a cell membrane.
D. only eukaryotic cells have mitochondria.
Answer: D
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A. ferns B. horsetails C. mosses D. gymnosperms E. angiosperms
A farmer performs truncation selection to try to increase the weight of peaches in his orchard. Which statement correctly describes a possible outcome of this selection?
A) If peach weight is not heritable, the average weight in the next generation will increase. B) If peach weight is heritable, the average weight in the next generation will increase. C) The average peach weight will decrease due to this inbreeding. D) If peach weight is heritable, the average weight in the next generation will decrease.
Which equation represents photosynthesis?
A) 6CO2 + 6O2 + sunlight ? C6H12O6 + 6H2O B) 6H2O + 6CO2 + sunlight ? C6H12O6 + 6O2 C) C6H12O6 + 6O2 + sunlight ? 6CO2 + 6H2O D) O2 + H2O + sunlight ? C6H12O6 + CO2
What are specialized cells (egg cells and sperm cells, for example) used for sexual reproduction?
What will be an ideal response?